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A method for introducing metal ions into sodium-type zeolite molecular sieves

A technology of zeolite molecular sieve and sodium-type zeolite, applied in the direction of crystalline aluminosilicate zeolite and the like, can solve the problems of high energy consumption, waste cost of metal salts, low utilization rate of metal salts, etc., and achieves simple process, cost reduction, and avoidance of high temperature. Effects of the roasting process

Active Publication Date: 2015-10-28
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The utilization rate of metal salt in this process is low, resulting in a large amount of waste of metal salt, which increases the cost and consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 5g of A-type zeolite molecular sieve powder, and 100ml with a concentration of 3mol / LNH 4 The Cl solution was mixed and placed in a water bath at 80°C for 1 hour, and then filtered and washed with suction. Repeat the above steps 3 times for the obtained sample. After the exchange is over, dry at less than 60℃;

[0026] Weigh the above 2g molecular sieve sample, and 100ml Ca(OH) with a concentration of 0.5mol / L 2 The solution is mixed and placed in a water bath at 80°C for ion exchange for 3 hours while blowing in air or nitrogen, and constantly replenishing Ca(OH) 2 Solution, maintain its initial concentration; the exchange ends when no ammonia is discharged. Then filtered, washed to neutrality, and dried to obtain a Ca-A zeolite molecular sieve sample with an exchange degree greater than 95%.

Embodiment 2

[0028] Take 5g of A-type zeolite molecular sieve original powder, and 250ml with a concentration of 1mol / LNH 4 NO 3 The solution was mixed and placed in a water bath at 70°C for 2 hours, filtered and washed with suction. Repeat the above steps twice for the obtained sample. After the exchange is over, dry at less than 60°C;

[0029] Weigh the above 2g molecular sieve sample, and 100ml Ba(OH) with a concentration of 0.8mol / L 2 The solution is mixed and placed in a 70°C water bath for ion exchange for 2 hours while blowing in air or nitrogen, and constantly replenishing Ba(OH) 2 Solution, maintain its initial concentration; the exchange ends when no ammonia is discharged. Then filtered, washed to neutrality, and dried to obtain a Ba-A zeolite molecular sieve sample with an exchange degree greater than 98%.

Embodiment 3

[0031] Take 15g of A-type zeolite molecular sieve original powder, and 300ml with a concentration of 3mol / LNH 4 NO 3 The solution was mixed and placed in a water bath at 70°C for 1 hour, then filtered and washed with suction. Repeat the above steps 4 times for the obtained sample. After the exchange is over, dry at less than 60℃;

[0032] Weigh the above 10g molecular sieve sample, mix it with 100ml of KOH solution with a concentration of 0.8mol / L, and place it in a 60℃ water bath for ion exchange for 4 hours while blowing in air or nitrogen, and constantly replenish the KOH solution to maintain its initial Concentration; the exchange ends when no ammonia is discharged. Then filtered, washed to neutrality, and dried to obtain a K-A zeolite molecular sieve sample with an exchange degree greater than 92%.

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Abstract

The invention discloses a method for introducing metal ions into a sodium type zeolite molecular sieve. The method comprises the following steps: mixing sodium type zeolite molecular sieve raw powder with a 0.5-5mol / L inorganic ammonium salt aqueous solution to perform ion exchange, performing suction filtration to obtain a filter cake, and washing the filter cake by deionized water; re-adding the washed filter cake in the ammonium salt aqueous solution to repeat ion exchange; after exchange, drying to obtain an ammonium type zeolite molecular sieve; mixing the ammonium type zeolite molecular sieve with a metal hydroxide solution to perform ion exchange, simultaneously introducing air or nitrogen and continuously supplying metal hydroxide to maintain the initial concentration, wherein the ion exchange is not finished until no ammonia gas is discharged; and filtering, washing to neutral, and drying so as to obtain the zeolite molecular sieve containing metal ions. The method has the advantages of low cost, high exchange degree, wide application range and the like.

Description

Technical field [0001] The invention belongs to the modification of molecular sieves, and specifically relates to a method for introducing metal ions into sodium zeolite molecular sieves Background technique [0002] Zeolite molecular sieve is made of TO 4 (T=Si, Al) tetrahedrons are arranged in a certain order in space through oxygen bridges to form crystalline aluminosilicates, which have an open framework structure. In its skeleton structure, because aluminum is positive trivalent, that is, AIO 4 The tetrahedron has a negative charge, so positively charged cations are needed to balance the skeleton charge. Since the cations in the molecular sieve have fluidity, when they are in contact with aqueous solutions containing different metal ions, the metal cations can enter the molecular sieve, and the original cations in the molecular sieve can be exchanged at the same time. The ion exchange performance of zeolite molecular sieve can not only change the type, size and position of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 李晓峰景超窦涛
Owner TAIYUAN UNIV OF TECH
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